MOTOROLA MC74AC194, MC74ACT194 Technical data

5-1

FACT DATA

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The MC74AC194/74ACT194 is a high-speed 4-bit bidirectional universal shift
register. As a high-speed multifunctional, sequential building block, it is useful in
a wide variety of applications. It may be used in serial-serial, shift left, shift right,
serial-parallel, parallel-serial, and parallel-parallel data register transfers. The
′AC/ACT194 is similar in operation to the ′AS195 universal shift register, with
added features of shift left without external connections and hold (do nothing)
modes of operation.

• Typical Shift Frequency of 150 MHz

• Asynchronous Master Reset

• Hold (Do Nothing) Mode

• Fully Synchronous Serial or Parallel Data Transfers

FUNCTIONAL DESCRIPTION

The MC74AC/74ACT194 contains four edge-triggered D flip-flops and the
necessary interstage logic to synchronously perform shift right, shift left, parallel
load and hold operations. Signals applied to the Select (S0, S1) inputs
determine the type of operation, as shown in the Mode Select Table. Signals
on the Select, Parallel data (P0–P3) and Serial data (DSR, DSL) inputs can
change when the clock is in either state, provided only that the recommended
setup and hold times, with respect to the clock rising edge, are observed. A
LOW signal on Master Reset (MR

) overrides all other inputs and forces the

outputs LOW.

MODE SELECT TABLE

Operating

Inputs Outputs

Operating

Mode

MR S1S0D

SRDSLPn

Q0Q1Q2Q

3

Reset L X X X X X L L L L
Hold H l l X X X q0q1q2q

3

H h l X l X q1q2q

3

L

Shift Left

H h l X h X q1q2q3H
H l h l X X L q0q1q

2

Shift Right

H l h h X X H q0q1q

2

Parallel Load H h h X X pnp0p1p2p

3

l = LOW voltage level one setup time prior to the LOW-to-HIGH clock transition.
h = HIGH voltage level one setup time prior to the LOW-to-HIGH clock transition.
Pn (qn) = Lower case letters indicate the state of the referenced input (or output) one setup

time prior to the LOW-to-HIGH clock transition.
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial





4-BIT BIDIRECTIONAL

UNIVERSAL SHIFT

REGISTER

N SUFFIX

CASE 648-08

PLASTIC

D SUFFIX

CASE 751B-05

PLASTIC

1

2 3 4 5 6 7

12131415

9
10
11

MR

CP

S

1

S

0

DSRP0P1P2P3D

SL

Q0Q1Q2Q

3

V

CC

GND

D

SL

P

3

P

2

P

1

15

16

14

12

11

10

2

1

3

4

5

6

7

98

P

0

D

SR

MR

S

0

S

1

CP

Q

3

Q

2

Q

1

Q

0

13

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MC74AC194 MC74ACT194

5-2

FACT DATA

D

SR

P

0

P

2

P

3

D

SR

Q

0

Q

1

Q

2

Q

3

CP

S

1

S

0

P

1

MR

CP
R

S Q

0

CLEAR

CP
R

S Q

1

CLEAR

CP
R

S Q

2

CLEAR

CP
R

S Q

3

CLEAR

LOGIC DIAGRAM

Please note that this diagram is provided only for the understanding of logic
operations and should not be used to estimate propagation delays.

MAXIMUM RATINGS*

Symbol Parameter Value Unit

V

CC

DC Supply Voltage (Referenced to GND) –0.5 to +7.0 V

V

in

DC Input Voltage (Referenced to GND) –0.5 to VCC +0.5 V

V

out

DC Output Voltage (Referenced to GND) –0.5 to VCC +0.5 V

I

in

DC Input Current, per Pin ±20 mA

I

out

DC Output Sink/Source Current, per Pin ±50 mA

I

CC

DC VCC or GND Current per Output Pin ±50 mA

T

stg

Storage Temperature –65 to +150 °C

* Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended

Operating Conditions.

MC74AC194 MC74ACT194

5-3

FACT DATA

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter Min Typ Max Unit

′AC 2.0 5.0 6.0

VCCSupply Voltage

′ACT 4.5 5.0 5.5

V

Vin, V

out

DC Input Voltage, Output Voltage (Ref. to GND) 0 V

CC

V

VCC @ 3.0 V 150

Input Rise and Fall Time (Note 1)
′AC Devices except Schmitt Inputs

VCC @ 4.5 V 40 ns/V

r

, t

f

′AC Devices except Schmitt Inputs

VCC @ 5.5 V 25
VCC @ 4.5 V 10

tr, t

f

Input Rise and Fall Time (Note 2)
′ACT Devices except Schmitt Inputs

VCC @ 5.5 V 8.0

ns/V

T

J

Junction Temperature (PDIP) 140 °C

T

A

Operating Ambient Temperature Range –40 25 85 °C

I

OH

Output Current — High –24 mA

I

OL

Output Current — Low 24 mA

1. Vin from 30% to 70% VCC; see individual Data Sheets for devices that differ from the typical input rise and fall times.

2. Vin from 0.8 V to 2.0 V; see individual Data Sheets for devices that differ from the typical input rise and fall times.

DC CHARACTERISTICS

74AC 74AC

Symbol

Parameter

V

CC

(V)

TA = +25°C

TA =

–40°C to +85°C

Unit

Conditions

Typ Guaranteed Limits

V

IH

3.0 1.5 2.1 2.1 V

OUT

= 0.1 V

4.5 2.25 3.15 3.15 V or VCC – 0.1 V

5.5 2.75 3.85 3.85

V

IL

3.0 1.5 0.9 0.9 V

OUT

= 0.1 V

4.5 2.25 1.35 1.35 V or VCC – 0.1 V

5.5 2.75 1.65 1.65

V

OH

3.0 2.99 2.9 2.9 I

OUT

= –50 µA

4.5 4.49 4.4 4.4 V

5.5 5.49 5.4 5.4
*VIN = VIL or V

IH

3.0 2.56 2.46

–12 mA

4.5 3.86 3.76

V

I

OH

–24 mA

5.5 4.86 4.76 –24 mA

V

OL

3.0 0.002 0.1 0.1 I

OUT

= 50 µA

4.5 0.001 0.1 0.1 V

5.5 0.001 0.1 0.1
*VIN = VIL or V

IH

3.0 0.36 0.44

12 mA

4.5 0.36 0.44

V

I

OL

24 mA

5.5 0.36 0.44 24 mA

I

IN

5.5

±0.1

±1.0

µA

VI = VCC, GND

I

OLD

5.5 75 mA V

OLD

= 1.65 V Max

I

OHD

Output Current

5.5 –75 mA V

OHD

= 3.85 V Min

I

CC

5.5

8.080µA

VIN = VCC or GND

* All outputs loaded; thresholds on input associated with output under test.
†Maximum test duration 2.0 ms, one output loaded at a time.
Note: IIN and ICC @ 3.0 V are guaranteed to be less than or equal to the respective limit @ 5.5 V VCC.

tr, t

f

Input Rise and Fall Time (Note 2)

Minimum High Level
Input Voltage

Maximum Low Level
Input Voltage

Minimum High Level
Output Voltage

Maximum Low Level
Output Voltage

Maximum Input
Leakage Current

†Minimum Dynamic

Maximum Quiescent
Supply Current